. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. of which, frompetals and theflask-like body 286 LESSOIf^S WITS PLANTS. there is difference of opinion as to its morphol-ogy. The walnuts and hickories are somewhatclosely allied to the oaks, and it is held by some that this husk isan involucre, although ithas none of the obvi-ous features (as scales)of an involucre. Othersregard the flask-like bodyas a calyx-tube, andthe four sepal-like partsas calyx lobes. In thehickory, the petals arewanting (Fig. 160), butthe characte
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. of which, frompetals and theflask-like body 286 LESSOIf^S WITS PLANTS. there is difference of opinion as to its morphol-ogy. The walnuts and hickories are somewhatclosely allied to the oaks, and it is held by some that this husk isan involucre, although ithas none of the obvi-ous features (as scales)of an involucre. Othersregard the flask-like bodyas a calyx-tube, andthe four sepal-like partsas calyx lobes. In thehickory, the petals arewanting (Fig. 160), butthe charactetristics of thecalyx-cup are very simi-lar. These two fruits show what a specializedfeature dehiscence or indehiscence is; and theyare particularly interesting as showing how muchour interpretation of particular structures dependsupon comparatively minor features. 337. The chestnut will now interest us. Amature bur is at Fig. 293. In this case there aretwo or more pistillate flowers (each with a wellmarked calyx) aggregated in a scaly and pricklyinvolucre. Does one chestnut develop from eachsingle flower? This involucre grows with the nuts,and becomes the 4-valved bur shOAvn in the pictur
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
